Note 10 - Share-based Compensation - Schedule of Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total stock-based compensation	$ 869	$ 803	$ 1,796	$ 1,582
Cost of Sales [Member]
Total stock-based compensation	100	88	200	167
Selling and Marketing Expense [Member]
Total stock-based compensation	119	134	288	293
General and Administrative Expense [Member]
Total stock-based compensation	557	495	1,118	951
Research and Development Expense [Member]
Total stock-based compensation	$ 93	$ 86	$ 190	$ 171